2004 chevy silverado 1500 4x4 4 door short box z71,, when i push the 4 wheel drive button the auto 4 wheel drive button starts blinking then stops and it shows to be n auto 4x4 but still only in two wheel drive. when i push the 4x4 hi or low button again it then switches to 4x4 but the 4x4 dont work unless the truck is in reverse, idk what to do, new encoder motor about 10k miles ago.
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